Growth and mortality of a main tree species after disturbance in Japanese northern forest: Effect of competition as a long-lasting stress
| Project/Area Number |
26450205
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Forest science
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| Research Institution | Hokkaido Research Organization |
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Principal Investigator |
OHNO YASUYUKI 地方独立行政法人北海道立総合研究機構, 森林研究本部林業試験場, 主査 (30414246)
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| Co-Investigator(Kenkyū-buntansha) |
渡邊 陽子 北海道大学, 農学研究院, 研究員 (30532452)
梅木 清 千葉大学, 大学院園芸学研究科, 准教授 (50376365)
吉田 俊也 北海道大学, 北方生物圏フィールド科学センター, 教授 (60312401)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 肥大成長 / 年輪幅指数 / 個体間競争 / 食葉性昆虫 / 素因 / 死亡 / ウダイカンバ / 気候応答 / 局所的競争効果 / 攪乱 / ウダイカンバ二次林 / 針広混交林 |
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| Outline of Final Research Achievements |
To clarify mortality pattern of Betula maximowicziana Regel （monarch birch） after the outbreak of herbivores insects in 2011, we analyzed the individual diameter growth (GD) in the period prior to the outbreak and the subsequent mortality (2012-2014). Individual GD were affected by the competition from neighbors and initial tree size: GD decreased with increasing asymmetric competition from Quercus crispula Blume (mizu oak) and with decreasing initial size. The growth reduction of monarch birch was imposed by asymmetrical competition from larger mizu oak, indicating that larger mizu oak might cause a reduction of light resources to monarch birch. During the three-year period after the outbreak, 17% of the observed trees died. Logistic regression analysis revealed that mortality rate increased with decreasing GD. These results suggest that the competition was an underlying stress factor that reduced the growth and raised the mortality after the outbreak.
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Report
(4 results)
Research Products
(1 results)
